6989664 has 48 divisors (see below), whose sum is σ = 20018880. Its totient is φ = 2117760.

The previous prime is 6989659. The next prime is 6989687. The reversal of 6989664 is 4669896.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2254 + ... + 4365.

It is an arithmetic number, because the mean of its divisors is an integer number (417060).

Almost surely, 2^6989664 is an apocalyptic number.

It is an amenable number.

6989664 is an abundant number, since it is smaller than the sum of its proper divisors (13029216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6989664 is a wasteful number, since it uses less digits than its factorization.

6989664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6643 (or 6635 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 6989664 is about 2643.7972690810. The cubic root of 6989664 is about 191.1989192472.

It can be divided in two parts, 69 and 89664, that multiplied together give a palindrome (6186816).

The spelling of 6989664 in words is "six million, nine hundred eighty-nine thousand, six hundred sixty-four".